oh shit RPGM games on the miyoo?? i’ll have to look into that. Mine recently borked itself while on vacation but I think I just need to reinstall onion on the SD.

Everyone recommends Cave Story through retroarch and I think you can even get Caves of Qud working on there, or I'm confusing the two.

I bought the R36S for my kids and the thing shipped with Stardew Valley on there. I don't know how but it works.

Well if you haven't already you should checkout pico8. It's a console that never really existed with an emulator where people make all sorts of cool games for it. Celeste was originally written for it: https://www.lexaloffle.com/bbs/?pid=11722

https://nerdyteachers.com/PICO-8/Games/Top200/

https://itch.io/jam/gbcompo25

I'm working on a Gameboy Color game now for this gamejam

There's a pretty robust modding community for Super Mario World (SNES). Many ROM hacks ranging from casual to kaiso.

This is piquing my curiosity about these retrohandhelds.

~~When it says things like "25,000 games" do they come with games preloaded or do you have to add them yourself?~~

Yes, apparently they do come with games installed. These things are pretty cool.

Golden Sun is my favorite Gameboy JPRG. Classic pokemon games are pretty good for some mindless fun. Idk what systems your thing can emulate but the early final fantasy games are pretty good as well.

I used to have a link to an archive of hundreds of indie roms but it's gone now

RetroAchievements allows achievements for homebrew roms, so they have a list of games that people cared enough about to make an achievement set for. No links to roms but it might give you some ideas. Link

If nothing else, there's always Disco Elysium: Game Boy Edition

Fire Emblem romhacks are really good, and it's like retro gaming with modern community-favorite features. I haven't played too deeply into many of them, but I completed The Morrow's Golden Country and loved it, and am running through it again after some time.